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200517.fm Page 56 Friday, March 18, 2005 2:52 PM
2005
Amination
O 0268
17- 054
Synthesis of β-Amino Esters via Aza-Michael Addition of Amines to Alkenes Promoted on Silica: A Useful and Recyclable Surface. — Both aliphatic and aromatic
primary and secondary amines undergo addition reaction to electron-deficient alkenes
(II), (IV), and (XI) on the surface of silica gel. The corresponding β-amino esters and
nitriles are formed in good to excellent yields. The silica gel can be recycled, and reused
without loss of activity in two further operations. — (BASU*, B.; DAS, P.;
HOSSAIN, I.; Synlett 2004, 14, 2630-2632; Dep. Chem., Univ. North Bengal,
Darjeeling 734 430, India; Eng.) — Klein
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