Enantioselective Zinc/BINOL-Catalysed Alkynylation of Aldimines Generated in Situ from α-Amido Sulfones
作者:Gonzalo Blay、Ana Brines、Alicia Monleón、José R. Pedro
DOI:10.1002/chem.201102909
日期:2012.2.20
amines have been prepared by the addition of terminal alkynes to imines generated in situfrom α‐amido sulfones in the presence of diethylzinc and BINOL‐type ligands as catalysts. The reactions give good yields and high enantioselectivities (ee values up to 95 %) for a good number of aromatic and heteroaromatic α‐amido sulfones and alkynes.
N-Benzyloxycarbonylamino sulfones react with aromatic ketones in the presence of catalytic amount of boron trifluoride-diethyl ether at room temperature to afford the corresponding protected β-amino ketones in high yields (71-87%). α-amido sulfones - stable imine precursors - aromatic ketones - BF3˙OEt2 - Lewis acids - β-amino ketones Part 200 in the series ‘Studies on Novel Synthetic Methodologies’
Improved facile synthesis of α-amino phosphonates by the reaction of α-amido sulfones with dialkyl trimethyl silyl phosphites catalyzed by Fe(III) chloride
作者:Boyapati Veeranjaneyulu、Biswanath Das
DOI:10.1080/00397911.2016.1270323
日期:2017.3.4
ABSTRACT An improved efficient synthesis of α-aminophosphonates has been discovered by the reaction of N-benzyloxycarbonylamino sulfones with dialkyl trimethyl silyl phosphites in the presence of FeCl3 as a catalyst. The products were formed in high yields (86–94%) within 2–4 h. The catalyst is inexpensive, easily available, and highly active. The unreacted dialkyl trimetyl silyl phosphites can easily
A Simple and Efficient Access to α-Amino Phosphonates from <i>N</i>-Benzyloxycarbonylamino Sulfones Using Indium(III) Chloride†Studies on Novel Synthetic Methodologies. 188.
作者:Biswanath Das、Kongara Damodar、Nisith Bhunia
DOI:10.1021/jo900558d
日期:2009.8.7
Treatment of N-benzyloxycarbonylamino sulfones with triethyl phosphite catalyzed by InCl3 produces the corresponding protected α-amino phosphonates in high yields (71−92%).
Indium(III) Chloride-Catalyzed Conversion of {[(Benzyloxy)carbonyl]amino}-Substituted Sulfones with 2-[(Trimethylsilyl)oxy]furan: A Facile Access to γ-Butenolactone Derivatives Containing a Protected Amino Group
Treatment of [(benzyloxy)carbonyl]amino}‐substituted sulfones 1 with 2‐[(trimethylsilyl)oxy]furan (2) in the presence of InCl3 as a catalyst at room temperature produced the γ‐butenolactone derivatives 3 and 4 containing a protected amino group (Scheme 1). The products were formed in high yields (81–92%) within 3–10 h favoring the anti‐isomer 3.