Benzo[b]thiophen-5-yl derivative and process for producing the s

Details Benzo[b]thiophen-5-yl derivative and process for producing the s Benzo[b]thiophen-5-yl derivative and process for producing the s

1994-03-29

1995-01-10

Robinson, Allen J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549 57, 549 58, 549440, 549447, C07D33352, C07D30778, C07D33356, C07D, C07D

Patent

active

053808789

ABSTRACT:
This invention relates to a process for producing a compound represented by formula (6a) or (6b): ##STR1## wherein R.sup.2 represents a hydrogen atom or a hydroxyl-protecting group and R.sup.4 and R.sup.5, which may be the same or different, represents lower alkyl groups, using a compound represented by formula (2a) or (2b) obtained by preferential crystallization: ##STR2## and also to a compound represented by the following formula (7) which is an intermediate useful for producing the compound of formula (6a) or (6b): ##STR3## wherein R.sup.1 represents a group represented by formula (8): ##STR4## wherein R.sup.2 and R.sup.3 is as defined above and R.sup.3 represents a hydrogen atom, a group or a carboxyl protecting group represented by formula (9): ##STR5## or a group represented by formula (10): ##STR6## wherein R.sup.2 is as defined above.

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