A method of selective conversion of Abienol, represented by formula 1, to Sclareodial, represented by formula 2 by ozonolysis and subsequent reduction. The ozonolysis is carried out at temperatures above -60 °C, preferably in nonhalogenated solvents. R is selected from H, acetals, aminals, optionally substituted alkyl groups, such as benzyl group, carboxylates such as acetates or formates, carbonates such as methyl or ethyl carbonates, carbamates, and any protecting group which can be attached to 1 and cleaved from 2, R' is selected from CH=CH2, an alkyl moiety with C2-C20, e.g. CH2-CH3, or a cycloalkyl or polycycloalkyl moiety with C3-C20, e.g. cyclopropyl, optionally alkylated, respectively, and the wavy bond is depicting an unspecified configuration of the adjacent double bond between C2 and C3.
一种通过
臭氧化和随后还原选择性转化Abienol(
化学式1)为Sclareodial(
化学式2)的方法。
臭氧化在-60°C以上的温度下进行,最好在非卤代溶剂中进行。R可以选择为H、
缩醛、缩胺、可选的取代烷基,如苄基、
羧酸酯,如
乙酸盐或
甲酸盐、
碳酸酯,如甲基或乙基
碳酸酯、
氨基甲酸酯,以及可以附加到1并从2中断裂的任何保护基团,R'可以选择为CH=
CH2、具有C2-C20的烷基残基,例如 -
CH3,或具有C3-C20的环烷基或多环烷基残基,例如环丙基,分别进行烷基化,波浪线表示C2和C3之间相邻双键的未指定构型。