A very practical and selective method for PMB protection of alcohols
摘要:
A very simple, practical and efficient one-step heterogeneous protocol for the PMB protection of alcohols using Amberlyst-15 has been developed. The stability and hazard issues regarding PMBCI and PMBBr are totally avoided by directly using anisyl alcohol for the protection. Alcohols are protected in very good yields. The selective mono-PMB protection of diols as well as di-PMB protection of diols was achieved in good yields, along with the demonstration of recyclability of the catalyst. (c) 2012 Elsevier Ltd. All rights reserved.
The synthesis of a family of bis(binaphthyl)-based compounds for the chiral modification of gold nanoparticle surfaces is described. In these systems, two (S)-1,1′-bi-2-naphthol groups are linked to one another by a single diethanolamine-derived bridge, the nitrogen atom of which serves as an anchor for the attachment of an alkanethiol tether of 6, 10, or 12 methylene units in length. The terminal thiol group allows the production of surface-elaborated gold nanoparticles of 2.1 ± 0.6 nm diameter by a ‘direct synthesis’ method.
A very practical and selective method for PMB protection of alcohols
作者:Subhash P. Chavan、Kishor R. Harale
DOI:10.1016/j.tetlet.2012.06.084
日期:2012.8
A very simple, practical and efficient one-step heterogeneous protocol for the PMB protection of alcohols using Amberlyst-15 has been developed. The stability and hazard issues regarding PMBCI and PMBBr are totally avoided by directly using anisyl alcohol for the protection. Alcohols are protected in very good yields. The selective mono-PMB protection of diols as well as di-PMB protection of diols was achieved in good yields, along with the demonstration of recyclability of the catalyst. (c) 2012 Elsevier Ltd. All rights reserved.
Asymmetric Total Synthesis of (+)-Didemniserinolipid B via Achmatowicz Rearrangement/Bicycloketalization
作者:Jingyun Ren、Rongbiao Tong
DOI:10.1021/jo501142q
日期:2014.8.1
of (+)-didemniserinolipid B in 19 linear steps, featuring a highly efficient and enantioselective construction of 6,8-dioxabicyclo[3.2.1]octane (6,8-DOBCO) framework via a rarely explored Achmatowiczrearrangement/bicycloketalization strategy. In addition, the first total synthesis of the proposed (+)-didemniserinolipid C was accomplished with 41.6% yield in 4 steps from a common advanced intermediate