provides polyfunctional phosphines in good yields. Especially attractive is the hydroboration/boron-zinc exchange sequence which allows the conversion of functionalized olefins into polyfunctional phosphines in a one-pot procedure. Several new chiral phosphines have been prepared starting from readily available chiral olefins (terpenes) and their efficiency in asymmetric hydrogenation reactions has been
A new efficient preparation of polyfunctional phosphines using zinc organometallics
作者:Falk Langer、Paul Knochel
DOI:10.1016/0040-4039(95)00813-r
日期:1995.6
The reaction of diorganozincs or organozinc halides with chlorophosphines (Ph(n)PCl(3-n)) produces polyfunctional phosphines in high yields. This method has been used to prepare several chiral phosphines in high enantiomeric purity.
Preparation of functionalized dialkylzinc reagents via an iodine-zinc exchange reaction. Highly enantioselective synthesis of functionalized secondary alcohols
作者:Michael J. Rozema、AchyuthaRao Sidduri、Paul Knochel
DOI:10.1021/jo00033a008
日期:1992.3
Functionalized dialkylzincs are obtained by the reaction of polyfunctional alkyl iodides with Et2Zn in excellent yield. Their treatment with aldehydes, in the presence of the titanium catalyst 6, affords functionalized secondary alcohols with high enantioselectivity.
Efficient and General Aerobic Oxidative Cross-Coupling of THIQs with Organozinc Reagents Catalyzed by CuCl<sub>2</sub>: Proof of a Radical Intermediate
general new method for the highly concise synthesis of C-1-alkylated tetrahydroisoquinolines (THIQ) is reported. The CuCl2-catalyzed procedure is based on a coupling of nonfunctionalized THIQs with organozincreagents under aerobic conditions. It proceeds in high yields and is broadly applicable to a wide range of substrates. It relies on a regioselective sp3 C–H bond activation allowing for an sp3–sp3