ChemInform Abstract: 2,6‐Difunctionalization of N‐Substituted Dithienothiazines via Dilithiation.

Abstract

2,6-Difunctionalization of N-Substituted Dithienothiazines via Dilithiation. -The regioselective 2-mono-and 2,6-difunctionalization of dithienothiazines is accomplished via lithiation followed by electrophilic trapping. Double Wittig olefination of product (IIIb) gives diester (IX). The synthesis of the latter can also be achieved in a one pot manner. -(DOSTERT, C.; CZAJKOWSKI, D.; MUELLER*, T. J. J.; Synlett 25 (2014) 3, 371-374, http://dx.doi.org/10.1055/s-0033-1340307 ; Inst. Org. Chem. Makromol. Chem., Heinrich-Heine-Univ., D-40225 Duesseldorf, Germany; Eng.) -Mais 30-173