Allylic C–H amination is currently accomplished with (sulfon)amides or carbamates. Here we show the first allylicamination that can directly afford alkyl allylamines, enabled by the reactivity of thianthrene-based nitrogen sources that can be prepared from primary amines in a single step.
electrocatalytic strategy for the cyclopropanation of activemethylenecompounds, employing an organic catalyst. The method shows a broad substrate scope and excellent scalability, requires no metal catalyst or external chemical oxidant, and provides convenient access to several types of cyclopropane-fused heterocyclic and carbocyclic compounds. Mechanistic investigations suggest that the reactions
Novel Tandem Conjugate Addition-Ramberg-Bäcklund Rearrangements
作者:Paul Evans、Richard Taylor
DOI:10.1055/s-1997-1540
日期:1997.9
A novel tandem process is reported for the preparation of allylic amines, ethers and sulfides from α-bromo-α,β-unsaturated sulfones; this process is believed to proceed via an initial conjugate addition followed by proton exchange and Ramberg-Bäcklund rearrangement.
On the reason for opposite diastereoselectivities of benzyllithium compounds containing lithium amide and lithium alkoxide functionalities
作者:Christian Mück-Lichtenfeld、Hubertus Ahlbrecht
DOI:10.1016/0040-4020(96)00535-2
日期:1996.7
benzyllithium compound 7 in good yield. The consecutive reaction with electrophiles exhibits a high anti diastereoselectivity, opposite to what has been earlier found for the oxygen analogue 3. PM3 semiempirical calculations on the intermediates show a preference of the anti configuration which is confirmed by 1H NMR. Measurements of the degree of aggregation show the dilithio compound 3 to exist as
的碳锂Ñ甲基-3-苯基-丙-2-烯基胺与叔丁基锂通向单体benzyllithium化合物7以良好的收率。与亲电试剂的连续反应显示出较高的抗非对映选择性,这与先前对氧类似物3的发现相反。中间体的PM3半经验计算显示,其抗构型的偏爱性已通过1 H NMR证实。聚集度的测量表明,二硫代化合物3以二聚物形式存在并且在THF中具有更高的聚集体。在此二聚体上的PM3计算可以解释不同的非对映选择性。