Direct Vinylogous Mannich-Type Reactions via Ring Opening and Rearrangement of Vinyloxiranes
作者:Mark Lautens、Eiji Tayama、Duy Nguyen
DOI:10.1021/ol036153j
日期:2004.2.1
2-methyl-2-vinyloxirane as a masked dienolate has been successfully demonstrated in the direct vinylogous Mannich-type reaction with an alpha-imino ester as an electrophile. The Mannich adduct was a useful intermediate en route to cis-5-substituted pipecolinic acid ethyl ester under simple hydrogenation conditions.
Discovery of redox system enabling C–N–C bonds formation: Unprecedented Aza-Cannizzaro reaction
作者:Abhishek Sud、Pramod S. Chaudhari、Ishu Agarwal、Amjad Basha Mohammad、Vilas H. Dahanukar、Rakeshwar Bandichhor
DOI:10.1016/j.tetlet.2017.04.010
日期:2017.5
derivatives probably indicate a pathway towards prebiotic chemistry. This proceeds analogous to Cannizzaro reaction involving ammonia therefore it can be termed as intramolecular Aza-Cannizzaro type reaction. This reaction is examined in detail with an aid of computational analysis to corroborate the proposed mechanism.
The present invention relates to perfumes of general formula (A)
It further relates to the use of the compounds of formula (A) for imparting or intensifying particular odor notes and/or particular odor impressions and a method of producing a perfume mixture or a perfumed product.
The development of an oxa-Diels–Alder reaction between sultines and carbonyl compounds is reported. o-Quinodimethanes, generated from sultines, undergo a [4+2]-cycloaddition with activated aldehydes or ketones in the presence of Cu(OTf)2 to provide a variety of functionalized isochromans, including spiroisochromans, in up to 99% yield. The developed protocol demonstrates broad functional-group compatibility
Siamyl Glyoxylate as an Efficient Enophile in the Lewis Acid Mediated Glyoxylate Ene-Reaction with Allylic Ethers. Application to the Synthesis of a Taxol A-Ring Subunit
作者:Johan Wennerberg、Magnus Polla、Torbjörn Frejd
DOI:10.1021/jo971082l
日期:1997.12.1
In contrast to other simple alkyl glyoxylates, siamyl glyoxylate (la) proved to be an effective enophile in the glyoxylate ene-reaction with the allylic ether 2a, which we earlier used for the synthesis of the A-ring subunit of taxol.