jo3001723_si_002.pdf (673.71 kB)
Transmissive Olefination Route to Putative “Morinol I” Lignans
journal contribution
posted on 2012-04-06, 00:00 authored by Lihua Yao, Bhaskar Pitta, P. C. Ravikumar, Matthew Purzycki, Fraser F. FlemingA series of morinol-type lignans were rapidly assembled
using a
Grignard-based transmissive olefination. In combination with palladium-catalyzed
arylations, the strategy provides stereoselective access to (7Z,7′E), (7E,7′E), and (7E,7′Z) morinol diastereomers and the (7Z,8′E) and (7E,8′E)
conjugated analogues. Critical for the E/Z stereoselectivity
is a new, general method for converting alkenenitriles to alkenemethanols
that circumvents the enal E/Z isomerization commonly
encountered during conventional i-Bu2AlH
reduction.