Carbonyl transposition and regio- and stereo-specific syntheses of new alcohols, amino-alcohols, and ketones in the monoterpenoid 1,3,3-trimethyl-2-oxabicyclo[2.2.2]octane
作者:Francesco Bondavalli、Pietro Schenone、Angelo Ranise、Silvia Lanteri
DOI:10.1039/p19800002626
日期:——
An efficient transposition of carbonyl group R1–CO–CH2–R2→ R1–CH2–CO–R2 in the 1,3,3-trimethyl-2-oxabicyclo[2.2.2]octane system was carried out via hydroboration–oxidation of 6-dialkylamino-1,3,3-trimethyl-2-oxabicyclo[2.2.2]oct-5-enes (3a–c), which gave regio- and stereo-specifically 6-cis-dialkylamino-1,3,3-trimethyl-2-oxabicyclo[2.2.2]octan-5-trans-ols (4a–c) in high yield. Cope reaction of the
在1,3,3-三甲基-2-氧杂双环[2.2.2]辛烷体系中进行了羰基基团R 1 –CO–CH 2 –R 2 → R 1 –CH 2 –CO–R 2的有效置换。通过氢硼化-氧化6-二烷基氨基-1,3,3-三甲基-2-恶二环[2.2.2]辛-5-烯(3a–c),得到区域和立体特异性的6-顺式-二烷基氨基- 1,3,3-三甲基-2-氧杂双环[2.2.2] octan -5-反式-ols(4a–c)高产率。应对氮的反应由氨基醇(4b)与过氧化氢制得的一氧化碳(5b)生成1,3,3-三甲基-2-氧杂双环[2.2.2]辛基-5-酮(6),这是其另一种可能的异构体众所周知的1,3,3-三甲基-2-氧杂双环[2.2.2] octan-6-one(1b)。酮(6)还由1,3,3-三甲基-2-氧杂双环[2.2.2]辛-5-烯(2)通过其反式环氧化物(11),氢化铝锂在160-165的还原度制得。其℃得到立体和区域特异性的1