A simple and stereoselective synthesis of Des-A-B-aromatic corticoids via intramolecular cycloaddition: potential intermediates for the synthesis of corticoids
作者:Hideo Nemoto、Mitsuo Nagai、Yuriko Abe、Keiichiro Fukumoto、Tetsuji Kametani
DOI:10.1039/c39850001316
日期:——
Intramolecular cycloaddition reaction of the o-quinodimathane (7) derived thermolysis of 3-isopropenyl-1-(4-methoxybenzocyclobuten-1-yl)-4-methylpent-4-en-3-ol (6) gave stereoselectively trans-3α-hydroxy-3β-isopropenyl-7-methoxy-3aβ-methyl-2,3,3a,4,5,9b-hexahydro-1H-benz[e]indene (8), which was efficiently converted into the bismethylenedioxy derivative (3) of the des-A-B-aromatic corticoid (10)via(9)
的分子内环化加成反应ø(-quinodimathane 7)热解衍生的3-异丙烯基-1-(4- methoxybenzocyclobuten -1-基)-4-甲基戊-4-烯-3-醇(6),得到立体选择性地反式-3 α -羟基-3β-异丙烯基-7-甲氧基-3aβ-甲基-2,3,3a,4,5,9b-六氢-1 H-苯并[ e ]茚(8),将其有效地转化为双亚甲基二氧基衍生物(3)在沙漠的甲-乙-芳香类皮质激素(10)通过(9)。