An aldol - bislactonization route to α-methylene bis-γ-butyrolactones
摘要:
The syntheses of alpha-methylene gamma-butyrolactones and alpha-methylene bis-gamma-butyrolactones are made simple through the use of the versatile dimethyl itaconate - anthracene adduct, 1. (C) 1998 Elsevier Science Ltd. All rights reserved.
Enantioselective synthesis of protected α-hydroxy aldehydes and ketones via hydroxylation of metalated chiral hydrazones
作者:Dieter Enders、Vidya Bhushan
DOI:10.1016/s0040-4039(00)87901-0
日期:1988.1
α-Benzyloxy aldehydes and α-acetoxy ketones 4 of high enantiomeric purity are prepared in good overall yields via oxaziridine mediated hydroxylation of chiral hydrazone azaenolates. As auxiliaries novel proline derived hydrazine reagents 5 are used.
The syntheses of alpha-methylene gamma-butyrolactones and alpha-methylene bis-gamma-butyrolactones are made simple through the use of the versatile dimethyl itaconate - anthracene adduct, 1. (C) 1998 Elsevier Science Ltd. All rights reserved.
Acid catalysis in aldol condensation of α-amino silyl ketene acetals. Diastereoselective synthesis of α-amino-β-hydroxyacids.
The aldol-type condensation between α-dibenzylamino trimethylsilyl keteneacetals and various achiral and chiral aldehydes in the presence of a Lewis acid furnishes α-amino-β -hydroxyacids in moderate yields with preferential C2C3 threo configuration.