Search for "two-directional synthesis" in Full Text gives 5 result(s) in Beilstein Journal of Organic Chemistry.
Beilstein J. Org. Chem. 2015, 11, 1123–1128, doi:10.3762/bjoc.11.126
Beilstein J. Org. Chem. 2012, 8, 850–860, doi:10.3762/bjoc.8.95
Beilstein J. Org. Chem. 2010, 6, No. 77, doi:10.3762/bjoc.6.77
Beilstein J. Org. Chem. 2008, 4, No. 4, doi:10.1186/1860-5397-4-4
Beilstein J. Org. Chem. 2005, 1, No. 2, doi:10.1186/1860-5397-1-2