US 6,335,458 B1 · Intermediate compounds in the synthesis of the A ring moiety of 2-substituted vitamin D derivatives

Abstract

The object of the present invention is to provide novel compounds corresponding to the A ring part of vitamin D derivatives having a substituent at the 2-position. According to the present invention, there are provided compounds of the general formula (1): (wherein R1, R2 and R3, which may be the same or different, represent a hydrogen atom or a protecting group and R4 represents a lower alkyl group), intermediates for synthesizing them and a process for preparing them.

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Facts

Application

09/623,163Filed 28 Aug 2000

Granted

1 Jan 2002

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

C07C 43/1787
Containing hydroxy or O-metal groups: containing six-membered aromatic rings and having unsaturation outside the aromatic rings
C07C 43/315
Compounds having [IMAGE cpc-sch-C07C-0958.gif] groups: containing oxygen atoms singly bound to carbon atoms not being acetal carbon atoms
C07C 69/734
Of unsaturated acids: ethers
Y02P 20/55
Improvements relating to the production of bulk chemicals: design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

Intermediate compounds in the synthesis of the A ring moiety of 2-substituted vitamin D derivatives

Life of this patent

Abstract

Claims0

Intermediate compounds in the synthesis of the A ring moiety of 2-substituted vitamin D derivatives

Life of this patent

Abstract

Claims0