AN EFFICIENT METHOD FOR THE SYNTHESIS OF SUBSTITUTED 4-ACETOXYNAPHTHALENE-2-CARBOXYLATE ESTERS, ETHYL 4-ACETOXYBENZOFURAN-6-CARBOXYLATE, AND ETHYL 4-ACETOXYBENZOTHIOPHENE-6-CARBOXYLATE
The present invention provides a nitrogen-containing saturated heterocyclic compound of the formula [I] which is useful as a renin inhibitor.
wherein R
1
is a cycloalkyl group or an alkyl,
R
22
is an optionally substituted aryl and the like,
R is a lower alkyl group,
R
3
, R
4
, R
5
and R
6
are the same or different, and are a hydrogen atom, an optionally substituted carbamoyl, an optionally substituted alkyl, or alkoxycarbonyl,
or a pharmaceutically acceptable salt thereof.
作者:Scott A. Snyder、Trevor C. Sherwood、Audrey G. Ross
DOI:10.1002/anie.201002264
日期:——
A polycyclic collapse: Use of a carefully designed acyclic intermediate participated in a cascade reaction that formed the entire core of the polyketide‐derived dalesconols in a single flask (see scheme). A number of additional and carefully controlled synthetic operations completed an expeditious synthesis of both of these highly bioactive natural products as well as structural congenors.
This strategy enabled us to control the two stereogenic sites in the B ring (C-5 and C-6) and the regioselective introduction of the carbohydrate moiety. The ABCD tetracycle could serve as an ideal platform for the divergent access to various BpAs. The amino acid (D-alanine) was introduced onto the ABCD tetracycle. Glycosylation was promoted by the combination of Cp(2)HfCl(2) and AgOTf (1:2 ratio). Construction
Lewis acid-promoted cyclizations of heteroatom-substituted enynes have been examined. The reaction of enynes 3 and 7 bearing silicon substituents on an alkyne afforded the halogenated five-membered γ-lactones 4 and γ-lactams 8 as the main products. The reaction of substrates 15 and 16 having 2-phosphonoacrylate instead of malonate also gave halogenated five-membered cyclic compounds 17 and 18 as the major products. The cyclized products are highly substituted and potentially useful for further synthetic transformations.
Renin Inhibitors. I. Synthesis and Structure-Activity Relationships of Transition-State Inhibitors Containing Homostatine Analogues at the Scissile Bond.
The synthesis and structure-activity relationships of transition-state renin inhibitors containing the homostatine analogues at the scissile bond are described. These inhibitors incorporate the amino acid side chains corresponding to positions 7-12 (P4-P2') of angiotensinogen. Ethyl, 2-hydroxyethyl and 3-hydroxypropyl groups at position 2 of the homostatine analogues (P1') are more effective for increasing potency than the isopropyl group. A combination of residues at P1, P3 and P4 is important for potency and this result auggests that S1, S3 and S4 form a huge hydrophobic core together in renin.