Synthesis and [4+2] Cycloaddition of (2R,2′R)-N,N′-Fumaroylbis[fenchane-8,2-sultam] (=(2E)-1,4-Bis[(3aS,6S,7aR)-1,4,5,6,7,7a-hexahydro-7,7-dimethyl-2,2-dioxido-3H-3a,6-methano-2,1-benzothiazol-1-yl]but-2-ene-1,4-dione) to Cyclopentadiene
作者:Anna M. Piątek、Agnieszka Chojnacka、Christian Chapuis、Janusz Jurczak
DOI:10.1002/hlca.200590181
日期:2005.9
derivative (−)-5d. Also the N-methyl- and N-acryloylfenchane-8,2-sultams (−)-5b,c were prepared, and both the reactivity and diastereoselectivity imparted by the new chiral auxiliary to N,N′-fumaroylbis[fenchane-8,2-sultam] (−)-5e were compared with those of (−)-1a by addition of cyclopenta-1,3-diene to (−)-5e, in various solvents and at different temperatures under TiCl4-mediated and uncatalyzed conditions