A wide range of vinyl sulfone-modified carbohydrates have been prepared as starting materials for the synthesis of polysubstituted chiral pyrroles. All these vinyl sulfones reacted efficiently with ethylisocyanoacetate to generate a plethora of new pyrrole derivatives. Furanosyl rings opened up during pyrrole synthesis, and pyranosyl rings were opened up by reacting the pyrrole with POCl3/DMF. This paper also reports one of the most efficient and practical routes for the synthesis of beta-substituted pyrroles.
Addition of amines and carbon nucleophiles to vinyl sulfone-modified 6-deoxy-hex-3-enopyranoside: a case of nucleophile dependent diastereoselectivity
作者:Rahul Bhattacharya、Tanmaya Pathak
DOI:10.1016/j.carres.2009.09.009
日期:2009.11
and carbon nucleophiles with 4-sulfonyl-hex-3-enopyranoside generate a range of C-3 amino- and C-3 branched-chainsugars, which are analogues of 3-amino-3,6-dideoxy sugars and 3-C-branched-chain-3,6-dideoxy sugars. The diastereoselectivity of addition reaction is nucleophile dependent; while both nitrogen and carbon nucleophiles added in cis-fashion, amines generated C3-C4 trans-diaxial products (gulo-derivatives)