<▼1><P>A new, bidentate, chiral directing group derived from 2,2-dimethyl-1-(pyridin-2-yl)propan-1-amine was discovered, which enables stereoselective palladium(<SMALL>II</SMALL>)-catalyzed intramolecular C(sp<SUP>3<...
http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
https://www.riss.kr/link?id=A107456558
2018
-
SCOPUS,SCIE
학술저널
1473-1480(8쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<▼1><P>A new, bidentate, chiral directing group derived from 2,2-dimethyl-1-(pyridin-2-yl)propan-1-amine was discovered, which enables stereoselective palladium(<SMALL>II</SMALL>)-catalyzed intramolecular C(sp<SUP>3<...
<▼1><P>A new, bidentate, chiral directing group derived from 2,2-dimethyl-1-(pyridin-2-yl)propan-1-amine was discovered, which enables stereoselective palladium(<SMALL>II</SMALL>)-catalyzed intramolecular C(sp<SUP>3</SUP>)–O bond formation.</P></▼1><▼2><P>The systematic investigation of chiral bidentate auxiliaries has resulted in the discovery of a chiral 2,2-dimethyl-1-(pyridin-2-yl)propan-1-amine-derived directing group that enables stereoselective palladium(<SMALL>II</SMALL>)-catalyzed intramolecular C(sp<SUP>3</SUP>)–O bond formation. This new chiral directing group exhibited high reactivity in the activation of methylene C(sp<SUP>3</SUP>)–H bonds with excellent levels of stereoselectivity (a diastereomeric ratio of up to 39 : 1), which allowed the construction of a wide range of oxaspirocycles. Mechanistic investigations were also conducted to elucidate the reaction mechanism and understand the origin of the diastereoselectivity. DFT calculations suggest that only modest levels of diastereoselectivity are accomplished at the rate-determining C–H metalation–deprotonation step and the d.r. is further enriched at the reductive elimination step.</P></▼2>