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Example 14
Cephem Conjugates
Cephem acetal linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The starting material [15690-38-7] is converted to a hydroxymethyl intermediate containing a side chain and protecting ester of choice as described in the literature (WO 96/04247). A cannabinoid (CBD) is converted to the O-chloromethyl intermediate via reported conditions (Bioorg. & Med. Chem., 26(2), 386-393; 2018; J. Amer. Chem. Soc., 136(26), 9260-9263; 2014; Faming Zhuanli Shenqing, 105037382, 11 Nov. 2015). The hydroxymethyl and O-chloromethyl intermediates are reacted under previously reported conditions (Tetrahedron, 60(12), 2771-2784; 2004) to generate the acetal link. Removal of the diphenylmethyl ester protecting group gives the product.
Carbacephem Conjugates
Carbacephem acetal linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The starting material [177472-75-2] is converted to a hydroxymethyl intermediate containing a side chain and protecting ester of choice as described in the literature (WO 96/04247). A cannabinoid (CBD) is converted to the O-chloromethyl intermediate via reported conditions (Bioorg. & Med. Chem., 26(2), 386-393; 2018; J. Amer. Chem. Soc., 136(26), 9260-9263; 2014; Faming Zhuanli Shenqing, 105037382, 11 Nov. 2015). The hydroxymethyl and O-chloromethyl intermediates are reacted under previously reported conditions (Tetrahedron, 60(12), 2771-2784; 2004) to generate the acetal link. Removal of the diphenylmethyl ester protecting group gives the product.
Penem Conjugates
Penem acetal linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. A cannabinoid (CBD) is converted to its O-chloromethyl intermediate via reported conditions (Bioorg. & Med. Chem., 26(2), 386-393; 2018; J. Amer. Chem. Soc., 136(26), 9260-9263; 2014; Faming Zhuanli Shenqing, 105037382, 11 Nov. 2015). This intermediate is reacted with a hydroxymethyl penem [88585-78-8] under reported conditions (Tetrahedron, 60(12), 2771-2784; 2004) to form the acetal link. Removal of the silyl ether and allyl ester protecting groups under standard conditions gives the product.
Carbapenem Conjugates
Carbapenem acetal linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. A cannabinoid (CBD) is converted to its O-chloromethyl intermediate via reported conditions (Bioorg. & Med. Chem., 26(2), 386-393; 2018; J. Amer. Chem. Soc., 136(26), 9260-9263; 2014; Faming Zhuanli Shenqing, 105037382, 11 Nov. 2015). This intermediate is reacted with a hydroxymethyl carbapenem [118990-99-1] under reported conditions (Tetrahedron, 60(12), 2771-2784; 2004) to form the acetal link. Removal of the allyl protecting groups under standard conditions gives the product.
Example 1
Cephem Conjugates
Cephem ether linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The CAS numbers for the two key building blocks is shown. Reaction conditions follow standard conditions for amine acylation in the first step to attach the cephem side chain, for alkylation of a phenol group of a cannabinoid in the second step with optional use of a catalyst or enhancer such as NaI, followed by standard removal of the p-methoxybenzyl protecting group in the third step to furnish the product. A di-alkylated product may also be obtained.
Carbacephem Conjugates
Carbacephem ether linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The general starting material [177472-75-2] was reported in racemic form as [54296-34-3] (Journal of the American Chemical Society (1974), 96(24), 7584) and is elaborated to the iodide intermediate after installing a side chain of choice using a previously reported process (WO 96/04247). Alkylation of CBD with the iodide followed by deprotection, both steps under standard conditions, provides the desired product.
Penem Conjugates
Penem ether linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The starting material [145354-22-9], prepared as reported (Journal of Organic Chemistry, 58(1), 272-4; 1993), is reacted with CBD under standard alkylating conditions. The silyl ether TBS protecting group is then removed followed by deallylation under known conditions to give the desired product.
Carbapenem Conjugates
Carbapenem ether linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The starting material [136324-03-3] is reacted with CBD under standard alkylating conditions. The silyl ether TES protecting group is then removed followed by removal of the p-methoxybenzyl ester protecting group under known conditions to give the desired product.
Example 18
Monobactam acetal linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The starting material [76855-69-1] is deacetylated under reported conditions (Journal of Fluorine Chemistry, 72(2), 255-9; 1995) to give the 2-hydroxy intermediate. This hydroxy group is then alkylated with the O-chloromethyl cannabinoid which is prepared as described in the cephem acetal example in this Application to form the acetal link. Removal of the silyl ether protecting group followed by sulfonation using established conditions gives the product.
Example 20
Monobactam thiocarbonate linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The starting material [76855-69-1] is deacetylated under reported conditions (Journal of Fluorine Chemistry, 72(2), 255-9; 1995) to give the 2-hydroxy intermediate. This hydroxy group is then reacted with thiophosgene and a cannabinoid (CBD) under standard basic conditions to form the carbonate link. Removal of the silyl ether protecting group followed by sulfonation using established conditions gives the product.
Example 22
Monobactam aminal linked β-lactam antibiotic cannabinoid conjugate components are synthesized according to the following Scheme. The starting material [76855-69-1] is converted to the corresponding amine under reported conditions (Organic Chemistry: An Indian Journal, 9(6), 229-235; 2013) to give the 2-amino intermediate. This amino group is then alkylated with the O-chloromethyl cannabinoid which is prepared as described in the cephem acetal example in this Application to form the acetal link. Removal of the silyl ether protecting group followed by sulfonation using established conditions gives the product.