Preparation of Functionalized Alkylmagnesium Derivatives Using an I/Mg-Exchange
作者:Christian B. Rauhut、Viet Anh Vu、Fraser F. Fleming、Paul Knochel
DOI:10.1021/ol8000987
日期:2008.3.1
Functionalized alkylmagnesium reagents bearing an acetal, a ketal, an ester, or a pyridine ring were prepared by an I/Mg-exchange using iPr2Mg.LiCl or ClMg(CH2)5MgCl.2LiCl starting from functionalized primary alkyl iodides.
Phenylboronic acid-catalyzed tandem construction of S–S and C–S bonds: a new method for the synthesis of benzyl disulfanylsulfone derivatives from <i>S</i>-benzyl thiosulfonates
A unique phenylboronic acid-catalyzed dimerization-sulfonylation of S-benzyl thiosulfonates has been disclosed. A metal-free tandem construction of S-S and C-S bonds is an operationally simple method to access a wide range of benzyl disulfanylsulfone derivatives in high to excellent yields. Moreover, the robustness of this tandem transformation has been demonstrated by gram-scale reactions, and a plausible
The 5‐heterofunctionalized triazoles are important scaffolds in bioactive compounds, but current clickreactions (CuAAC) cannot produce these core structures. A copper(I)‐catalyzed interruptedclickreaction to access diverse 5‐functionalized triazoles is reported. Various 5‐amino‐, thio‐, and selenotriazoles were readily assembled in one step in high yields. The reaction proceeds under mild conditions
A copper(I)‐catalyzed asymmetric, three‐component interrupted Kinugasa reaction has been developed. Diverse chiral sulfur‐containing chiral β‐lactams with two consecutive stereogenic centers were synthesized in one step from readily available starting materials in good yields and with excellent diastereo‐ and enantioselectivity. The key is the interception of in situ formed chiral four membered copper(I)
Enabling olefin metathesis on proteins: chemical methods for installation of S-allyl cysteine
作者:Justin M. Chalker、Yuya A. Lin、Omar Boutureira、Benjamin G. Davis
DOI:10.1039/b908004j
日期:——
Multiple, complementary methods are reported for the chemical conversion of cysteine to S-allyl cysteine on protein surfaces, a useful transformation for the exploration of olefin metathesis on proteins.