Patent · US Expired

Bis(ortho-diarylphosphinophenyl)-tetrahydro-bi(1,3-oxazole) and a preparation method thereof

US5994556A · kind A · utility

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14Claims

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Assignee

KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY · KR

Inventors

Sang Gi Lee · Daejeon, KR
Choong Eui Song · Seoul, KR
Chung-woo Lim · Seoul, KR

Key dates

Filing date	Dec 9, 1998
Grant date	Nov 30, 1999
Priority date	—
Expiry date	Dec 9, 2018

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07B2200/07
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to optically pure bis(o-diarylphosphinophenyl)-tetrahydro-bi(1,3-oxazole) compounds represented by the formula (I) and a preparation method thereof. Bis(o-diarylphosphinophenyl)-tetrahydro-bi(1,3-oxazole) compounds of the present invention include (4S,4'S)-2,2'-bis(o-diarylphosphinophenyl)-4,4',5,5'-tetrahydro-4,4'-bi(1, 3-oxazole) represented by the formula (Ia) and its enantiomer, (4R,4'R)-2,2'-bis(o-diarylphosphinophenyl)-4,4',5,5'-tetrahydro-4,4'-bi(1, 3-oxazole) represented by the formula. The compounds of the present invention can be utilized in asymmetric hydrosilylation, hydrogenation, cyclopropylation and alkylation reactions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.