General and Stereoselective Method for the Synthesis of Sterically Congested and Structurally Diverse <i>P</i>-Stereogenic Secondary Phosphine Oxides
作者:Zhengxu S. Han、Hao Wu、Yibo Xu、Yongda Zhang、Bo Qu、Zhibin Li、Donald R. Caldwell、Keith R. Fandrick、Li Zhang、Frank Roschangar、Jinhua J. Song、Chris H. Senanayake
DOI:10.1021/acs.orglett.7b00568
日期:2017.4.7
A general and efficient method for the synthesis of bulky and structurally diverse P-stereogenic chiral secondary phosphine oxides (SPOs) by using readily available chiral amino alcohol templates is described. These chiral SPOs could be used as chiral building blocks for the synthesis of difficult-to-access bulky P-stereogenic phosphine compounds or ligands for organic catalysis.
This invention is for phosphinoline and phosphindoline compounds having the formula, Wherein n is 0 or 1; X is 0 or S; R.sup.3 is hydrogen or methyl; R.sup.5 is hydrogen or methyl, or may be bound to R.sup.13 to form a morpholino, piperidino or pyrrolidino ring; R.sup.7 is hydrogen or hydroxy; R.sup.11 and R.sup.12 are hydrogen; R.sup.13 is methyl, or R.sup.13 and R.sup.5 may be joined together as above stated to form a morpholino, piperidino, or pyrrolidino ring. The compounds are analgesics.
PHENYLALKYL BACKBONE MODIFIED OLIGODEOXYNUCLEOTIDES, THEIR SYNTHESIS AND THE INFLUENCE OF THE ALKYL CHAIN LENGTH
作者:Stefan Amberg、Joachim W. Engels
DOI:10.1081/ncn-100002535
日期:2001.3.31
Phenylalkyl modified phosphoramidites (alkyl chain length n = 1, 2, 3, 5; Fig. 1) were synthesised and incorporated into a DNA hexamer (5'-d(GCCp-GCG); p = place of modification). The obtained diastereomeres were separated by RP-HPLC. After hybridisation with the complementary DNA strand T-m-value and thermodynamic data were measured. The stability of duplexes depends on the linker length and the absolute configuration of the backbone modified oligodeoxynucleotides (Rp, Sp).
US3931196A
申请人:——
公开号:US3931196A
公开(公告)日:1976-01-06
Synthesis and Properties of Nonpolar DNA (Arylalkyl)phosphonates
The eight (arylalkyl)-modified phosphoramidites (=(arylalkyl)phosphonamidites) 1-8 (Fig. 2) were synthesized (Schemes 1-3) and incorporated at different positions into 2'-deoxyoligonucleotides. The [P(R)]and [P(S)]-diastereoisomers of the hexanucleotides 32-39 (Table 1) and of the dodecanucleotides 41-45 (Table 2) obtained were separated by means of reversed-phase HPLC. UV, CD, and fluorescence spectroscopy were used to investigate the thermal stability (T-m) and the structural changes of their DNA duplexes with 5'-d(CGCGCG)-3' and 5'-d(ATGATTGACCTG)-3', respectively. The T-m values significantly depend on the place of modification (Table 2). A dangling-end effect is observed when the [3-(anthracen-9-yl)propyl]-modified 8 is attached at the 5'-terminus (see duplex with 45c). In the case of the incorporation of aromatic moieties tethered via a methylene linker to the P-atom (benzyl- and (naphthalen-1-ylmethyl)-modified 1 and 6, resp.), the duplexes with the [P(R)]-oligonucleotides are more stable than those with the [P(S)]-isomers, whereas in the case of longer alkyl chains at the P-atom (see 2-5), the T-m values show the reverse tendency. The observed T-m differences are assigned to changes in base stacking (Figs. 6 and 7).