Reagents for asymmetric allylation, aldol, and tandem aldol and allylation reactions
申请人:Leighton L. James
公开号:US20050288525A1
公开(公告)日:2005-12-29
A new class of reagents and method of use of the reagents in the reaction of the reagents with electrophilic compounds. The invention in one embodiment is directed to a method for the formation of an alcohol of the formula (I). The method includes reacting reagent of the formula (II) with an aldehyde of the formula R
10
CHO to form the alcohol. X
3
is one of O and C(R
4
)(R
5
). Each of X
1
and X
2
is independently O or N—R. Each of C
a
and C
b
is independently an achiral center, an (S) chiral center or an (R) chiral center. R
a
and R
b
are (i) each independently C
1-10
alkyl, C
6-10
aryl or C
3-9
heteroaryl, or (ii) taken together to form a C
3
-C
4
alkylene chain which together with C
a
and C
b
forms a 5-membered or 6-membered aliphatic ring. R
c
and R
d
are each independently hydrogen, C
1-10
alkyl, C
6-10
aryl or C
3-9
heteroaryl. R is C
1-10
alkyl, C
6-10
aryl or C
3-9
heteroaryl. Each of R
1
, R
2
, R
3
, R
4
, R
5
is independently hydrogen, C
1
-C
10
alkyl, C
6-10
aryl, C
3-9
heteroaryl, C
1-10
alkoxy, C
6-10
aryloxy, C
1-10
dialkylamino, C
1-10
alkyl-C
6-10
arylamino, C
1-10
diarylamino, or halogen. R
6
is halogen, hydrogen, C
1-10
alkyl, C
6-10
aryl, C
3-9
heteroaryl, C
1-10
alkoxy, C
6-10
aryloxy, C
1-10
alkyl-C
6-10
arylamino, C
1-10
diarylamino, OSO
2
CF
3
or SR. R
10
may be C
1-10
alkyl, C
6-10
aryl, or C
3-9
heteroaryl.
一种新的试剂类别及其在与亲电性化合物反应中的使用方法。该发明在一种实施例中涉及一种制备式(I)的醇的方法。该方法包括将式(II)的试剂与式R10CHO的醛反应以形成醇。X3是O和C(R4)(R5)中的一个。X1和X2各自独立地是O或N-R。Ca和Cb各自是一个无手性中心,一个(S)手性中心或一个(R)手性中心。Ra和Rb是(i)各自独立的C1-10烷基,C6-10芳基或C3-9杂环芳基,或(ii)一起形成一个C3-C4烷基链,该链与Ca和Cb一起形成一个5-成员或6-成员脂环。Rc和Rd各自独立地为氢,C1-10烷基,C6-10芳基或C3-9杂环芳基。R为C1-10烷基,C6-10芳基或C3-9杂环芳基。R1、R2、R3、R4、R5各自独立地为氢,C1-C10烷基,C6-10芳基,C3-9杂环芳基,C1-10烷氧基,C6-10芳氧基,C1-10二烷基氨基,C1-10烷基-C6-10芳基氨基,C1-10二芳基氨基或卤素。R6为卤素,氢,C1-10烷基,C6-10芳基,C3-9杂环芳基,C1-10烷氧基,C6-10芳氧基,C1-10烷基-C6-10芳基氨基,C1-10二芳基氨基,OSO2CF3或SR。R10可以是C1-10烷基,C6-10芳基或C3-9杂环芳基。