Enantiospecific and diastereoselective synthesis of 4,4-disubstituted-3-amino-2-azetidinones, starting from D-serine
作者:Giuseppina Ageno、Luca Banfi、Giuseppe Casciob Giuseppe Guanti、Elso Manghisi、Renata Riva、Valeria Rocca
DOI:10.1016/0040-4020(95)00427-a
日期:1995.7
A strategy for the preparation of 4,4-disubstituted-3-amino-2-azetidinones which are useful intermediates for the synthesis of analogues of monosulfactam Tigemonam, was developed. It employs D-serine as chiral starting material and involves, as key steps, the diastereoselective addition of organometal compounds to ketones 9 and the stereospecific cyclization of tertiary alcohols 7 to the beta-lactams 6.