Asymmetric 1,4-Dihydroxylation of 1,3-Dienes by
Catalytic Enantioselective Diboration [J. Am. Chem.
Soc. 2009, 131, 9134–9135]. Heather E. Burks,
Laura T. Kliman, and James P. Morken*
-
Additional analytical data have revealed that the platinum
complex used for this study is more accurately represented by
the formula Pt(dba)3 rather than Pt2(dba)3. While Pt2(dba)3 used
at the loading described in the paper is equally effective, the
data in the paper was acquired with Pt(dba)3, and therefore Table
1, Scheme 3, and Scheme 4 should read “3 mol % Pt(dba)3”.
The Supporting Information has been modified to provide
procedures for the preparation of both Pt complexes.
The absolute configuration of the product in entry 9 of Table
1 is opposite to that depicted.
Subsequent experiments for entry 11 in Table 1 have revealed
that, while <10% of the 1,4-diboration product is produced from
this substrate, 54% yield of the 1,2-diboration product is
observed. This additional data suggest that, while the S-cis
conformation appears requisite for formation of the 1,4-
diboration product, it is not a requirement for the diboration in
general.
Supporting Information Available: Characterization and
procedures. This material is available free of charge via the
JA1072542
10.1021/ja1072542
Published on Web 09/10/2010
Pt-Catalyzed Enantioselective Diboration of Terminal
Alkenes with B2(pin)2 [J. Am. Chem. Soc. 2009, 131,
13210–13211]. Laura T. Kliman, Scott N. Mlynarski, and
James P. Morken*
Additional analytical data have revealed that the platinum
complex used for this study is more accurately represented by
the formula Pt(dba)3 rather than Pt2(dba)3. While Pt2(dba)3 used
at the loading described in the paper is equally effective, the
data in the paper were acquired with Pt(dba)3, and therefore
Table 1, Table 2, and Scheme 2 should read “3 mol % Pt(dba)3”.
The catalyst employed in Scheme 1 should read “0.6 mol %
Pt(dba)3”. The penultimate sentence of the second paragraph
should read “Second, a ligand loading of 2 equiv, relative to
platinum, results in optimal selectivity and yield; with 3.3 equiv
of ligand precomplexed to Pt, only 9% yield of product is
obtained.” The Supporting Information has been revised to
include procedures for preparing both platinum complexes.
Supporting Information Available: Characterization and
procedures. This material is available free of charge via the
JA107255H
10.1021/ja107255h
Published on Web 09/10/2010
9
10.1021/ja1072542 2010 American Chemical Society
J. AM. CHEM. SOC. 2010, 132, 13949 13949
Kliman, Laura T.
