Hypervalent iodine catalysis for selective oxidation of Baylis–Hillman adducts via in situ generation of o-iodoxybenzoic acid (IBX) from 2-iodosobenzoic acid (IBA) in the presence of oxone
作者:Raktani Bikshapathi、Parvathaneni Sai Prathima、Vaidya Jayathirtha Rao
DOI:10.1039/c6nj02628a
日期:——
An efficient, environmentally benign, eco-friendly protocol for selectiveoxidation of primary and secondary Baylis–Hillman alcohols to the corresponding carbonyl compounds has been developed. We have demonstrated the catalytic use of o-iodoxybenzoic acid (IBX) generated in situ from 2-iodosobenzoic acid (IBA) in the presence of oxone (2KHSO5·KHSO4·K2SO4) as a co-oxidant. This efficientmethod notably
已经开发出一种有效的,对环境无害的,环境友好的方案,用于将伯利兹和仲伯利兹-希尔曼醇选择性氧化为相应的羰基化合物。我们已经证明了在氧酮(2KHSO 5 ·KHSO 4 ·K 2 SO 4)作为助氧化剂存在下,由2-碘代苯甲酸(IBA)原位生成的邻碘氧苯甲酸(IBX)的催化用途。这种有效的方法尤其可以在不使用任何有毒重金属和直接使用棘手的IBX的情况下更好地提高产量。此外,可以通过还原后处理方便地回收合成的催化剂。
Formal [3+2] Annulation Involving Allylic Bromides and Thioureas. Synthesis of 2-Iminothiazolidines through a Base-Catalyzed Intramolecular<i>anti</i>-Michael Addition
作者:Misael Ferreira、Marcus M. Sá
DOI:10.1002/adsc.201401026
日期:2015.3.9
A simple and efficient protocol was developed for the synthesis of 2‐iminothiazolidines through a base‐mediated [3+2] annulation involving substituted thioureas and allylic bromides bearing electron‐withdrawing groups. This domino process consists of nucleophilic displacement, followed by intramolecular anti‐Michael addition of the preformed allylic isothiourea under mild conditions to give the thiazolidine