A facile procedure is described whereby Î9-THC aldehydes 4, as their tert-butyldimethylsilyl derivatives, are conveniently oxidized to the corresponding acids with sodium chlorite in the presence of a large excess of 2-methyl-2-butene without isomerization of the Î9-double bond. Deprotection of the O-protecting group with tetrabutylammonium fluoride in tetrahydrofuran gave the acids 2 in an overall yield of ≥ 80%. A study of other oxidizing agents and protecting groups demonstrated that this is the procedure of choice for the preparation of 9-carboxy-Î9-tetrahydrocannabinols.
本文介绍了一种简便的方法,即在大量过量的
2-甲基-2-丁烯存在下,用
亚氯酸钠将δ9-
四氢大麻酚醛 4 及其叔丁基二甲基
硅烷衍
生物方便地氧化成相应的酸,而不会发生δ9-双键的异构化。 在
四氢呋喃中用
四丁基氟化铵对 O 保护基进行脱保护处理,得到酸 2,总收率≥80%。对其他氧化剂和保护基团的研究表明,这是制备 9-羧基-δ9-
四氢大麻酚的首选方法。