Reactions between allenylzinc carbenoid 1 and various imines were examined; trans-substituted alkynylaziridines were produced with excellent diastereoselectivity.((C) Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002).
The asymmetric synthesis of β-lactam antibiotics - I. application of chiral oxazolidones in the staudinger reaction.
作者:David A. Evans、Eric B. Sjogren
DOI:10.1016/s0040-4039(00)89250-3
日期:1985.1
The reactions of oxazolidone 1 with N-benzylimines proceed with exceptional levels of asymmetric induction to form the cycloadducts 2. Subsequent dissolving metal reduction affords the homochiral β-lactam derivatives 3 in good overall yield (eq 1).
Highly Diastereoselective Addition Reaction of Ketene Silyl Acetals to Imines Catalyzed by Samarium(III) Iodide
作者:Ryuuichirou Hayakawa、Makoto Shimizu
DOI:10.1246/cl.1999.591
日期:1999.7
In the presence of a catalytic amount of a samarium(III) iodide, the addition reaction of ketene silyl acetal to imine afforded the corresponding β-aminoester with high anti-selectivity. The reaction of chiral imine under the same conditions gave β-aminoester with high diastereoselectivity.
Stereoselective Synthesis of β‐Lactams by Using D‐Mannitol‐Derived Oxazolidin‐2‐one as a Chiral Auxiliary
作者:Dong Gyun Shin、Hye Jin Heo、Jong‐Gab Jun
DOI:10.1081/scc-200050961
日期:2005.3
have been demonstrated to undergo highly diastereoselective β‐lactamsynthesis via the Staudinger reaction with Mukaiyama reagent. Stereoselectivity for cis‐β‐lactam was the result of the [2 + 2] cycloaddition reaction of ketene to trans imines, and cyclohexylidene showed better yield and stereoselectivity than the isopropylidene auxiliary.