Tocopherol synthesis: chromane cyclization and catalysis

Details Tocopherol synthesis: chromane cyclization and catalysis Tocopherol synthesis: chromane cyclization and catalysis

1990-04-05

1992-05-05

Chan, Nicky

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549410, C07D31172

Patent

active

051109557

ABSTRACT:
The invention relates to a process for the manufacture of vinylchromanes. This process is concerned with the manufacture of the compounds having the formula ##STR1## wherein R.sup.o is hydrogen or a cleavable protecting group, and comprises cyclizing a compound having the formula ##STR2## wherein R.sup.o is defined above and R.sup.1 is

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