Rhodium generated carbonyl ylides with p -quinones: synthesis of oxa-bridged polycyclic systems
作者:Sengodagounder Muthusamy、Srinivasarao Arulananda Babu、Chidambaram Gunanathan、Eringathodi Suresh、Parthasarathi Dastidar、Raksh Vir Jasra
DOI:10.1016/s0040-4020(01)00657-3
日期:2001.8
cycloaddition with p-quinones to furnish various novel oxa-bridged polycyclic systems 10, 13 and 11, 14 as CC and CO addition products of p-quinones. Very interesting unusual cyclization product, tri-oxapolycyclic compounds 12 and 15 were also obtained. Single-crystal X-ray analyses of 11a, 12d and 14a are reported to firmly establish the structure and stereochemistry of the oxa-bridged polycyclic systems.
使用重氮甲烷溶液或甲磺酰叠氮合成了一系列具有不同系链长度的α-重氮羰基化合物,这些化合物被束缚在取代的环戊酮和环己酮单元上。上述具有乙酸铑(II)二聚体的合成的α-重氮羰基化合物提供环状的五元或六元环羰基内立德偶极,其与对苯二酚进行容易的1,3-偶极环加成,从而提供各种新颖的氧杂桥联多环化合物系统10,13和11,14作为CC和CO加成产物p -quinones。非常有趣的异常环化产物,三氧杂多环化合物12和15也获得了。据报道,对11a,12d和14a进行单晶X射线分析可牢固地确定氧杂桥联多环系统的结构和立体化学。分子11a和14a在晶体结构中显示出新颖的C–H⋯O氢键基序。另一方面,分子12d在固态结构中同时显示O–H⋯O和C–H⋯O基序。