Total synthesis of (+)-isatisine a: application of a silicon-directed mukaiyama-type [3 + 2]-annulation.
Boston, United States. In J Org Chem, Apr 2015
The synthesis highlights the use of a highly diastereoselective Mukaiyama-type [3 + 2]-annulation of allylsilane 5 with the unsaturated aldehyde 9a to assemble the functionalized tetrahydrofuran core of isatisine A. A convergent route to the framework of the natural product was established that employed a substrate-controlled indole coupling that was followed by a late-stage intramolecular copper(I)-mediated amidation to complete the assembly of the tetracyclic framework of (+)-isatisine A. In addition, the scope of the [3 + 2]-annulation was evaluated and enhanced utilizing diastereomeric allylsilanes anti-5 and syn-5 to establish an efficient route to stereochemically well-defined tetrahydrofurans.
Early-onset obesity and paternal 2pter deletion encompassing the ACP1, TMEM18, and MYT1L genes.
Reims, France. In Eur J Hum Genet, 2014
deletion with a minimal critical region estimated at 1.97 Mb and encompassing seven genes, namely SH3HYL1, ACP1, TMEMI8, SNTG2, TPO, PXDN, and MYT1L genes.
Concerning the 1,5-stereocontrol in tin(IV) chloride promoted reactions of 4- and 5-alkoxyalk-2-enylstannanes: trapping intermediate allyltin trichlorides using phenyllithium.
Manchester, United Kingdom. In Org Biomol Chem, 2012
Transmetallation of the 5-benzyloxy-4-methylpent-2-en-1-yl(tributyl)- and -(triphenyl)stannanes 1 and 8 using tin(iv) chloride generates an allyltin trichloride that reacts with aldehydes to give (Z)-1,5-anti-6-benzyloxy-5-methylhex-3-en-1-ols 2. The allyltin trichloride believed to be the key intermediate in these reactions has been trapped by phenyllithium to give anti-5-benzyloxy-4-methylpent-1-en-3-yl(triphenyl)stannane 9. Transmetallation of this anti-5-benzyloxy-4-methylpent-1-en-3-yl(triphenyl)stannane 9 generated an allyltin trichloride that reacted with aldehydes to give the (Z)-1,5-syn-6-benzyloxy-5-methylhex-3-en-1-ols 23 and was trapped by phenyllithium to give syn-5-benzyloxy-4-methylpent-1-en-3-yl(triphenyl)stannane 24.
syn-5,10,15-Tris(dichloro-meth-yl)-5,10,15-trihy-droxy-5H-diindeno-[1,2-a:1',2'-c]fluorene dichloro-methane 0.82-solvate.
Baton Rouge, United States. In Acta Crystallogr Sect E Struct Rep Online, 2012
The title compound, C(30)H(18)Cl(6)O(3)·0.82CH(2)Cl(2),
The role of herpes simplex virus glycoproteins in the virus replication cycle.
Bratislava, Slovakia. In Acta Virol, 1998
Unusually large polykaryocytes arise due to mutations in syn (syncytium) loci of the viral genome, which were mapped to UL53 (syn1) and UL27 (syn3) genes coding for gK and gB, respectively, while the genes UL20 and UL24 (both syn5) code for nonglycosylated cell membrane-associated proteins ("membrane proteins").