Catalytic hydroformylation of (1S,5S)-(−)- and (1R,5R)-(+)-β-pinene: stereoselective synthesis and spectroscopic characterization of (1S,2R,5S)-, (1S,2S,5S)-, (1R,2R,5R)- and (1R,2S,5R)-10-formylpinane
作者:Fabrizio Azzaroni、Paolo Biscarini、Silvia Bordoni、Giuliano Longoni、Emanuela Venturini
DOI:10.1016/0022-328x(95)05778-n
日期:1996.2
(1S,5S)-(−)- and (1R,5R)-(+)-β-pinene have been hydroformylated in toluene to give (1S,2R,5S)- and (1R,2S,5R)-10-formylpinane with up to 95% diastereoselectivity using bimetallic CoRh(CO)7 as a catalyst; the latter was generated in situ from preformed Co2Rh2(CO)12 or a stoichiometric mixture of either [Rh4(CO)12] or [Rh6(CO)16] and [Co2(CO)8]. At 70–125°C and under 60 atm of syngas, the yields of hydroformylated
(1 S,5 S)-(-)-和(1 R,5 R)-(+)- β- pine烯已在甲苯中加氢甲酰化,得到(1 S,2 R,5 S)-和(1 R使用双金属CoRh(CO)7作为催化剂,具有高达95%的非对映选择性的,2 S,5 R)-10-甲酰基pin烷; 后者由预制的Co 2 Rh 2(CO)12或[Rh 4(CO)12 ]或[Rh 6(CO)16 ]和[Co 2(CO)8 ]。在70–125°C和60atm的合成气下,加氢甲酰化产物的收率不会超过30%,这是因为β-pine烯会同时异构化为α-pine烯。在所有情况下,催化剂都是以可溶性羰基钴衍生物和包含大部分铑(主要为[Rh 6(CO)16 ] )的晶体沉淀物的混合物形式回收的。通过在四氢呋喃中与作为催化剂前体的[Rh 4(CO)12 ]和[N(PPh 3)2 ] Cl的混合物进行反应,可获得相当的收率和非对映选择性。