Semicarbazide intermediates for preparing 4-substituted indoles

Details Semicarbazide intermediates for preparing 4-substituted indoles Semicarbazide intermediates for preparing 4-substituted indoles

1983-03-02

1984-06-12

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

568424, 564 36, C07C 7946, C07C 7935, C07C 7900

Patent

active

044543379

ABSTRACT:
A new chemical sequence for preparing certain indoles is disclosed which employes certain 2-substituted-6-nitrophenylacetaldehyde semicarbazones claimed here. Said semicarbazones are cyclized to the indoles by low pressure hydrogenation.

REFERENCES:
patent: 3753680 (1973-08-01), Tilles
patent: 4063025 (1977-12-01), Murakami et al.
patent: 4214001 (1980-07-01), Engelhardt et al.

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