Synthesis of bicyclo[3.2.2]nonadienones via enantioselective cyclopropanation of racemic cyclohexen-3-yl diazoacetate
作者:Paul Müller、Gérald Bernardinelli、Patrice Nury
DOI:10.1016/s0957-4166(02)00105-2
日期:2002.4
Optically active (1S,5R)-(+)-3-azabicyclo[3.2.2]non-6-en-2-one (+)-7 was synthesized via enantioselective intramolecular cyclopropanation of racemic cyclohexen-3-yl diazoacetate 10 in the presence of [Rh2((2S)-meox}4] catalyst. The cyclopropanation product (−)-9 was converted to the azide 8, which underwent successive Curtius and 3-aza-Cope rearrangements to afford 18, which was reduced to the bicyclic
通过外消旋环己烯-3-基重氮乙酸酯的对映选择性分子内环丙烷化合成了旋光的(1 S,5 R)-(+)-3-氮杂双环[3.2.2] non-6-en-2-one(+)- 7 10在的[Rh存在2 - ((2小号)-meox} 4 ]催化剂的环丙烷化产物( - ) - 9转化为叠氮化物8,其进行连续Curtius重和3-氮杂-科普重排反应,得到18,将其还原为双环one庚酮(+)- 7。得到基于SEM保护的烯醇醚20的Cope重排的类似序列(1 S,5 R)-双环[3.2.2] nona-3,6-dien-2-one 22。