Metalated Nitriles: Halogen−Metal Exchange with α-Halonitriles
作者:Fraser F. Fleming、Zhiyu Zhang、Paul Knochel
DOI:10.1021/ol036202s
日期:2004.2.1
[reaction: see text] Alpha-halonitriles react with organometallic reagents in a facile halogen-metal exchange. The halogen-metal exchange is extremely fast with Grignard and alkyllithium reagents, generating metalated nitriles in situ with aldehyde, ketone, acid chloride, and acylcyanide electrophiles. Sequential halogen-metal exchange and methylation of conformationally constrained nitriles is highly
作者:Fraser F. Fleming、Subrahmanyam Gudipati、Zhiyu Zhang、Wang Liu、Omar W. Steward
DOI:10.1021/jo0501184
日期:2005.5.1
Diastereoselectivealkylations of metalated conformationally locked 4-tert-butylcyclohexanecarbonitrile are highly diastereoselective with magnesium and copper counterions but only modestly diastereoselective with lithium as the counterion. Selective generation of diverse metalated nitriles is readily achieved through bromine−magnesium, −copper, and −lithium exchange reactions of the corresponding