Patents by Inventor Yuh-Goo Pan

Yuh-Goo Pan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the preparation of 5,6-diacetoxyindole
    Patent number: 5262546
    Abstract: An indole of the formula ##STR1## wherein R.sub.5 and R.sub.6 are acetoxy or hydrogen, at least one of R.sub.5 and R.sub.6 being acetoxy, is prepared, in good yield, in a one pot synthesis, without extraction, recrystallization or isolation of intermediate reaction product; A compound of the formula ##STR2## wherein R.sub.1 and R.sub.2 are benzyloxy or hydrogen, provided that at least one of R.sub.1 and R.sub.2 is benzyloxy, is subjected to reductive cyclization followed by acetylation of the resultant reaction product.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: November 16, 1993
    Assignee: Clairol, Inc.
    Inventors: Yuh-Goo Pan, Mu-Ill Lim