KNIGHT, DEREK J.;LIN, PETER;RUSSELL, SIMON T.;WHITHAM, GORDON H., J. CHEM. SOC. PERKIN TRANS.,(1987) N 12, 2701-2705
作者:KNIGHT, DEREK J.、LIN, PETER、RUSSELL, SIMON T.、WHITHAM, GORDON H.
DOI:——
日期:——
Chiral Lithiated Allylic α-Sulfonyl Carbanions: Experimental and Computational Study of Their Structure, Configurational Stability, and Enantioselective Synthesis
of sulfone (R)‐EtCHCHCH(Et)SO2tBu (94 % ee) with nBuLi in THF at −105 °C occurred with a calculated enantioselectivity of 93 % ee and gave carbanion (M)‐[EtCHCHC(Et)SO2tBu]Li, the deuteration and alkylation of which with CF3CO2D and MeOCH2I, respectively, proceeded with high enantioselectivities. Time‐dependent deuteration of the enantioenriched carbanion (M)‐[EtCHCHC(Et)SO2tBu]Li in THF gave a
的X射线晶体结构分析的锂化烯丙基α-磺酰基负碳离子[CH 2 CHC(Me)的SO 2 PH]李⋅二甘醇二甲醚,[ C ^ C ^ 6 ħ 8 SO 2吨卜]李⋅ PMDETA和[ C ^ C ^ 7 ħ 10 SO 2吨卜]李⋅ PMDETA显示二聚体和单体CIP中,具有几乎平坦的阴离子个C原子的,只有ö 李键,几乎平面烯丙基单元具有较强的ç C键长度交替和s-反绕C1构象 C2 。他们采用C1S构象,与通常在烷基和芳基取代的α-磺酰基碳负离子上发现的构象相似。[EtCH 3 CHC(Et)SO 2 t Bu] Li在THF中的结晶在164 K下发现,单体与二聚体之间的平衡比为83:17,这与低温NMR光谱法相似。根据NMR光谱,C1处的孤对轨道与CC双键强烈相互作用。低温6栗,1个h的NOE实验[EtCHCHC(ET)SO 2吨卜]锂在THF点仅具有ö单体CIP中之间的平衡李键并且具有均为O
Knight, Derek J.; Lin, Peter; Russell, Simon T., Journal of the Chemical Society. Perkin transactions I, 1987, p. 2701 - 2706
作者:Knight, Derek J.、Lin, Peter、Russell, Simon T.、Whitham, Gordon H.