TandemDiels-Alder Reactivity Controlled by Remote Substituents. Regioselective synthesis of linearly annellated six-membered ring systems from (1RS,5SR,6RS,7SR)-6,7-bis(chloromethyl)-8,9-dimethylidene-2-oxabicyclo[3.2.2]nonan-3-one. Crystal structure of (1RS,5RS,6SR,11RS)-6,7-bis(chloromethyl)-3-oxo-2-oxatricyclo[7.4.0.1,5]tridec-8-en-11-yl methyl ketone
作者:Bernard Demarchi、Pierre Vogel、Alan A. Pinkerton
DOI:10.1002/hlca.19880710537
日期:1988.8.10
constants of the two successive Diels-Alder additions of a given dienophile to 12 and 13 were nearly the same. Lewis-acid-catalyzed Diels-Alder addition of methyl vinyl ketone to 14 gave adduct 39 with high regio- and stereoselectivity. Lewis acids isomerized 39 into(1RS,5RS,6SR,7SR,11RS)-6,7-bis(chloromethyl)-3-oxo-2-oxatricyclo[7.4.0.01,5]tridec-8-en-11-yl methyl ketone (40) whose structure was determined
6,7,8,9-四亚甲基-2-恶双环[3.2.2] nonan-3-的合成(12),6,7,8,9-四亚甲基-2-氮杂三环[3.2.2] nonan-3 -一个(13)和(1 RS,5 SR,6 RS,7 SR)-6,7-双(氯甲基)-8,9-二甲基-2-氧杂双环-[3.2.2] nonan-3-one (14)提出。给定的亲二烯体到12和13的两个连续Diels - Alder添加的速率常数几乎相同。路易斯酸催化的狄尔斯-甲基乙烯基酮在14中的Alder加成反应得到加合物39具有高区域选择性和立体选择性。路易斯酸将39异构化为(1RS,5RS,6SR,7SR,11RS)-6,7-双(氯甲基)-3-氧代-2-氧杂三环[7.4.0.0 1,5 ] tridec-8-en-11-yl甲基酮(40),其结构由单晶X射线晶体学确定。加热39与CSF /铯2 CO 3在DMF / HMPT,得到(1个RS,5个RS,11个RS)-6