Visible light triggered regioselective ring expansion of N-tosylaziridines: An efficient approach to 2-nitroazetidines
作者:Ritu Kapoor、Shubhangi Tripathi、Sachchida N. Singh、Twinkle Keshari、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2017.08.042
日期:2017.10
Visible light induced ringexpansion of N-tosylaziridines with 1-bromo-1-nitroalkanes to afford 2-nitroazetdines in moderate to excellent yields with high regio- and diastereoselectivity is reported. The salient features of the protocol include the first synthesis of 2-nitroazetidines, operational simplicity, utilization of clean, inexpensive and sustainable resources like visible light and atmospheric
an ortho-C(sp2) atom of aromatic acids with aliphatic aziridines to construct the β-arylethylamine skeleton via C–H activation has been developed. The reaction proceeded under mild conditions with great substrate scope. Meanwhile, the β-arylethylamine skeleton in drugs or bioactive compounds could be easily generated in a single step. A catalytic amount of cesium carbonate was crucial to realizing
A process for aziridination of olefins using NaIO4/alkali metal bromide/H
+
/Chloramine-T combination in presence of dipolar aprotic solvent under ambient conditions to obtain aziridines is disclosed.
Absolute configuration of insect-produced epilachnene
作者:Jay J. Farmer、Athula B. Attygalle、Scott R. Smedley、Thomas Eisner、Jerrold Meinwald
DOI:10.1016/s0040-4039(97)00490-5
日期:1997.4
Samples of (R) and (S)-epilachnene [(5Z)-11-propyl-12-azacyclotetradec-5-en-14-olide] were synthesized from (R) and(S)-norvaline. The diastereomeric alpha-methoxy-alpha-trifluoromethylphenylacetyl amides of these synthetic samples, prepared using (S) alpha-methoxy-alpha-trifluoromethylphenylacetyl chloride, were well resolved by gas chromatography. Analogous derivatization and gas chromatographic analysis of a sample of epilachnene from the pupal secretion of the coccinellid beetle, Epilachna varivestis, established that the natural product is (S)-epilachnene. (C) 1997 Elsevier Science Ltd.