One-pot synthesis of N-substituted (3-oxobutanyl)carbamates from primary amines using modified zeolite Hβ at room temperature
作者:Vivek P. Raje、Ramakrishna P. Bhat、Shriniwas D. Samant
DOI:10.1016/j.tetlet.2004.11.156
日期:2005.1
The one-pot synthesis of N-substituted (3-oxobutanyl)carbamates via the tandem condensation of primaryamines with methyl chloroformate, followed by the conjugate addition of the resulting carbamate with methyl vinyl ketone in the presence of Sn4+ modified zeolite Hβ (Hβ-SnA) at room temperature is described.
Polyvinyl Pyridine as a Novel Solid Heterogeneous, Recyclable Catalyst for aza-Michael Reaction
作者:Shriniwas Samant、Vivek Raje、Ramakrishna Bhat
DOI:10.1055/s-2006-949381
日期:2006.9
Polyvinyl pyridine (PVP) is prepared by radical polymerization of 4-vinyl pyridine. PVP was used as a heterogeneous basic catalyst for the aza-Michael reaction of secondary amines and carbamates with α,β-unsaturated esters, cyanides and ketones to obtain the corresponding adducts in excellent yields (70-90%).