Synthesis of Unnatural Selenocystines and β-Aminodiselenides via Regioselective Ring-Opening of Sulfamidates Using a Sequential, One-Pot, Multistep Strategy
作者:Nasir Baig Rashid Baig、R. N. Chandrakala、V. Sai Sudhir、Srinivasan Chandrasekaran
DOI:10.1021/jo1001388
日期:2010.5.7
high yield from sulfamidates under mild reaction conditions using potassium selenocyanate and benzyltriethylammonium tetrathiomolybdate ([BnNEt3]2MoS4) in a sequential, one-pot, multistep reaction. The tolerance of multifarious protecting groups under the reaction conditions is discussed. The methodology was successfully extended to the synthesis of selenocystine, 3,3′-dialkylselenocystine, and 3,3′-
在一个连续的,一锅多步的多步反应中,使用硒氰酸钾和四硫代钼酸苄基三乙铵([BnNEt 3 ] 2 MoS 4),在温和的反应条件下,由氨基磺酸盐高产率地合成了各种N-烷基-β-氨基二硒化物。讨论了反应条件下多种保护基的耐受性。该方法已成功扩展到硒代胱氨酸,3,3'-二烷基硒代胱氨酸和3,3'-二苯基异硒代胱氨酸的合成及其直接掺入肽中。
Reactivity of cyclic sulfamidates towards lithium acetylides: synthesis of alkynylated amines
synthetically useful level of reactivity of cyclic sulfamidates toward acetylides is described. Ring-opening reactions of a structurally diverse set of 1,2- and 1,3-cyclic sulfamidates with a range of lithium acetylides from aliphatic, cyclic, aromatic, heteroaromatic, and functionalized alkynes proceed smoothly in a regioselective manner to give the corresponding N-sulfate intermediates. Hydrolysis of these
New carbon carbon bond forming reactions of cyclic sulfate esters and cyclic sulfamidates
作者:Melanie K Pound、Darren L Davies、Melanie Pilkington、Maria M de Pina Vaz Sousa、John D Wallis
DOI:10.1016/s0040-4039(02)00138-7
日期:2002.3
Carbon–carbon bonding forming reactions of two cyclicsulfate esters and a cyclic sulfamidate are reported, the former with lithium dianions to give substituted tetrahydrofuran derivatives with displacement of sulfate, and the latter undergoes ring-opening monosubstitution reactions with stabilised organolithiums and an organocuprate species.
Facile Synthesis of β-Amino
Disulfides, Cystines, and Their Direct Incorporation into
Peptides
作者:Srinivasan Chandrasekaran、Nasir Baig R. B.、Catherine Kanimozhi、V. Sai Sudhir
DOI:10.1055/s-0028-1088133
日期:——
the synthesis of beta-amino disulfides by regioselectiveringopening of sulfamidates with benzyltriethylammonium tetrathiomolybdate [BnNEt3](2)MoS4. Stability and reactivity of different protecting groups under the reaction conditions have been discussed. This methodology has also been extended to serine and threonine derived sulfamidates to furnish cystine and 3,3'-dimethyl cystine derivatives.