Face Selection in Additions to the Trigonal C2 Site in Quaternized 5-Azaadamantane Derivatives
摘要:
The quaternary N-allyl bromide salt 5 of allyl alpha-[2-(5-azaadamantylidene)]benzyl ether upon warming gave the Claisen rearrangement products 6 is the ratio E/Z = 93:7. The epoxidation of the N-oxide 8 of 2-methylene-5-azaadamantane 7 with m-CPBA gives rise to the two diastereomeric epoxides 9 in the ratio E/Z = 19:81. Reaction of the methyl iodide salt of this olefin with bromine in water produces the E- and Z-dibromides 10 in the ratio 74:26 as well as the corresponding glycols 12 in the ratio 86:14. The same reaction in methanol gives the E- and Z-isomers of 10 alone, in the ratio of 35:65. The interpretation is that, in all of these reactions, the trigonal carbon preferably undergoes addition at that face which is antiperiplanar to the more electron-rich vicinal bonds, and does so by margins substantially in excess of those observed with the corresponding 5-fluoroadamantanes. This fact lends further strength to our previously drawn conclusion that hyperconjugative transition state stabilization is the principal factor in the electronic component of face selection.
[EN] AZAADAMANTANE DERIVATIVES AND METHODS OF USE<br/>[FR] DÉRIVÉS D'AZA-ADAMANTANE ET PROCÉDÉS D'UTILISATION
申请人:ABBOTT LAB
公开号:WO2008058096A2
公开(公告)日:2008-05-15
(EN) The invention relates to compounds that are azaadamantane derivatives of formula (I), particularly ether- or amine -substituted azaadamantane derivatives and salts and prodrugs thereof, compositions comprising such compounds, methods of using such compounds and compositions, processes for preparing such compounds, and intermediates obtained during such processes.(FR) Cette invention concerne des composés qui sont des dérivés d'aza-adamantane, en particulier des dérivés d'aza-adamantane substitué par un éther ou une amine, ainsi que leurs sels et précurseurs, des compositions comprenant de tels composés, des procédés utilisant de tels composés et compositions, des procédés de préparation de tels composés et les intermédiaires obtenus au cours de tels procédés.