A new synthetic method for functionalized cyclopentanones was developed on the basis of a [3+2] cycloaddition reaction of a 1-(methylthio)-2-siloxyallyl cationic species and olefins. Allyl acetates 1a and 1b, which are the precursors of the allyl cationic species, are easily prepared in three or four steps from commercially available compounds. Under the influence of EtAlCl2 or AlCl3, 1a or 1b reacted
Parrod, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1944, vol. 218, p. 599
作者:Parrod
DOI:——
日期:——
Hemisynthetic Method and New Compounds
申请人:Cuevas Carmen
公开号:US20080045713A1
公开(公告)日:2008-02-21
Methods are provided for preparing a compound with a fused ring structure of formula (XIV) which comprises one or more reactions starting from a 21-cyano compound of formula (XVI) where typically; R
1
is an amidomethylene group or an aryloxymethylene group; R
5
and R
8
are independently chosen from —H, —OH or —OCOCH
2
OH, or R
5
and R
8
are both keto and the ring A is a p-benzoquinone ring; R
14a
and R
14b
are both —H ozone is —H and the other is —OH, —OCH
3
or —OCH
2
CH
3
, or R
14a
and R
14b
together form a keto group; and R
15
and R
18
are independently chosen from —H or —OH, or R
5
and R
8
are both keto and the ring A is a p-benzoquinone ring. In modified starting materials, the 21-cyano group can be replaced by other groups introduced using nucleophilic reagents.
Antitumoral analogs of ET-743
申请人:Manzanares Ignacio
公开号:US20080051407A1
公开(公告)日:2008-02-28
Antitumor compounds have the five membered fused ring ecteinascidin structure of the formula (XIV). The present compounds lack a 1,4-bridging group as found in the ecteinascidins. They have at the C-1 position a substituent selected from an optionally protected or derivatised aminomethylene group or an optionally protected or derivatised hydroxymethylene group.
Anititumoral Ecteinascidin Derivatives
申请人:Flores Maria
公开号:US20080146580A1
公开(公告)日:2008-06-19
This invention relates to antitumoral ecteinascidin derivatives.