Organic compounds -- part of the class 532-570 series – Organic compounds – Four or more ring nitrogens in the bicyclo ring system
Patent
1988-11-29
1990-06-26
Daus, Donald G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Four or more ring nitrogens in the bicyclo ring system
435122, 544320, C07D47504
Patent
active
049373420
ABSTRACT:
The present invention relates to intermediates for synthesizing BH.sub.4 and derivatives thereof. The intermediates are shown as follows: ##STR1## wherein R.sub.1 is a hydrogen atom, alkyl, aralkyl, or aryl group; R.sub.2 is an alkyl, hydroxyalkyl, or polyhydroxyalkyl group; R.sub.3 and R.sub.4 are the same or different and represent alkyl, aralkyl, or aryl group; R.sub.5, R.sub.6, R.sub.7, and R.sub.8 are the same or different and represent a hydrogen atom or acyl group; R.sub.9 is an alkyl, aralkyl, or aryl group; R.sub.10 and R.sub.11 are the same or different and represent a hydrogen atom or acyl group; n is an integer of 5 or less; and HX is an acid. The invention also relates to a process for the preparation of L-biopterin.
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Kurono Masayasu
Ogasawara Tomio
Ohishi Nobuko
Susuki Takehiko
Yagi Kunio
Daus Donald G.
Kabushiki Kaisha Vitamin Kenkyusyo
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