US PATENT SUBCLASS 548 / 508
.~.~.~.~.~.~ Processes of forming the bicyclo ring system by cyclization (e.g., forming indole from o-ethyl aniline, etc.)

Current as of: June, 1999
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548 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
416  DF  .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5}
452  DF  .~.~.~.~ Bicyclo ring system having the five-membered hetero ring as one of the cyclos (e.g., octahydroindoles, etc.) {7}
469  DF  .~.~.~.~.~ The bicyclo ring system consists of the five-membered hetero ring and a benzene ring (e.g., indole, etc.) {10}
508.~.~.~.~.~.~ Processes of forming the bicyclo ring system by cyclization (e.g., forming indole from o-ethyl aniline, etc.)

DEFINITION

Classification: 548/508

(under subclass 469) Processes wherein the bicyclo ring system is formed by ring closure.

(1) Note. Examples of processes provided for herein are: cyclization of o-ethyl aniline to form indole, and cyclization of 3-butyl pyrrole to form indole.