US PATENT SUBCLASS 546 / 19
.~.~.~.~.~ At least three ring hetero atoms in the two rings which form the spiro

Current as of: June, 1999
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546 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24}
15  DF  .~.~.~ Spiro {1}
16  DF  .~.~.~.~ The spiro includes the six-membered hetero ring {2}
19.~.~.~.~.~ At least three ring hetero atoms in the two rings which form the spiro {1}
20  DF  .~.~.~.~.~.~> At least three ring nitrogens in the two rings which form the spiro

DEFINITION

Classification: 546/19

At Least three ring hetero atoms in the two rings which form the spiro:

(under subclass 16) Compounds wherein the spiro ring system

contains at least two ring hetero atoms in addition to the ring nitrogen of the six-membered hetero ring.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]