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Title:
PREPARATION OF SPIROHYDANTOIN COMPOUND AND SYNTHETIC INTERMEDIATE
Document Type and Number:
Japanese Patent JPH0285287
Kind Code:
A
Abstract:

NEW MATERIAL:A compound of formula I (R1 and R2 are H or the protecting group for the amino group; R3-R5 are H or the protecting group for OH) and a salt thereof.

EXAMPLE: 5-[(2R),(3R)-4-Benzyloxy-2,3-isopropylidenedioxy-trans-butylidene]-3-(4- methoxybenzyl)hydantoin.

USE: A synthetic intermediate for novel spirohydantoin compounds useful as herbicides and plant growth-regulating agents. The spirohydantoin compounds are readily synthesized in high yields.

PREPARATION: A compound of formula II is reacted with a compound of formula III in a solvent (preferably benzene) in the presence of an anion-generating reagent (preferably sodium ethoxide) at -50-150°C for 10min-15hr to provide the cis and trans isomers mixture of the compound of formula I.


Inventors:
MIZUKAI MUNEHARU
MIO SHIGERU
Application Number:
JP16766189A
Publication Date:
March 26, 1990
Filing Date:
June 29, 1989
Export Citation:
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Assignee:
SANKYO CO
International Classes:
C07D233/78; A01N43/90; C07D233/96; C07D307/14; C07D405/06; C07D491/107; C07H7/02; C07H9/04; (IPC1-7): A01N43/90; C07D233/78; C07D233/96; C07D307/14; C07D405/06; C07D491/107; C07H7/02; C07H9/04